1402155021 has 4 divisors (see below), whose sum is σ = 1869540032. Its totient is φ = 934770012.

The previous prime is 1402154993. The next prime is 1402155031. The reversal of 1402155021 is 1205512041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1402155021 - 2¹⁴ = 1402138637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1402155031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233692501 + ... + 233692506.

It is an arithmetic number, because the mean of its divisors is an integer number (467385008).

Almost surely, 2^1402155021 is an apocalyptic number.

It is an amenable number.

1402155021 is a deficient number, since it is larger than the sum of its proper divisors (467385011).

1402155021 is an equidigital number, since it uses as much as digits as its factorization.

1402155021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467385010.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1402155021 is about 37445.3604736288. The cubic root of 1402155021 is about 1119.2626473762.

Adding to 1402155021 its reverse (1205512041), we get a palindrome (2607667062).

The spelling of 1402155021 in words is "one billion, four hundred two million, one hundred fifty-five thousand, twenty-one".